Do you work for them or something?
Fluid XP becomes conductive over time just like distilled water does, and I have seen many a thread where components were killed using it. New distilled water is almost non-conductive anyway. And of course it won't corrode waterblocks. Distilled water doesn't either. Galvanic corrosion is caused by electricity + metals that are too dissimilar. All copper/brass components won't corrode anyway.
The cheapest, most effective solution is distilled water, maybe 5-10% antifreeze for its PH buffers, a few drops of algaecide, and a few drops of alcohol-free povidone iodine. Some here use Tygon Silver tubing instead of algaecide/iodine to inhibit growth and that works as well.